Changelog for `miner_changeTargetGasLimit` (#1482)

Co-authored-by: Tim Beiko <t.beiko23@gmail.com>

Signed-off-by: Ratan Rai Sur <ratan.r.sur@gmail.com>

CHANGELOG.md

@@ -4,6 +4,7 @@
 
 ### Additions and Improvements
 * `--random-peer-priority-enabled` flag added. Allows for incoming connections to be prioritized randomly. This will prevent (typically small, stable) networks from forming impenetrable peer cliques. [#1440](https://github.com/hyperledger/besu/pull/1440)
+* `miner_changeTargetGasLimit` RPC added. If a target gas limit is set, allows the node operator to change it at runtime.
 * Hide deprecated `--host-whitelist` option. [\#1444](https://github.com/hyperledger/besu/pull/1444)
 * Prioritize high gas prices during mining. Previously we ordered only by the order in which the transactions were received. This will increase expected profit when mining. [\#1449](https://github.com/hyperledger/besu/pull/1449)
 * Added support for the updated smart contract-based [node permissioning EEA interface](https://entethalliance.github.io/client-spec/spec.html#dfn-connectionallowed). [\#1435](https://github.com/hyperledger/besu/pull/1435)